Not as an online course or document, but I can highly recommend the following book: https://mitpress.mit.edu/books/audio-programming-book https://mitpress.mit.

Not as an online course or document, but I can highly recommend the following book: https://mitpress.mit.edu/books/audio-programming-book https://mitpress.mit.edu/books/audio-programming-book It's fairly heavy going, but very comprehensive.